I have the Eibach lowering springs on my 96 and I can fit 315's on 17" 95 cobra R's. All I had to do was tweak the passenger side tail pipe in a half inch. Hell I even run M/T E/T streets that are 11.5 wide when I go to the track
My wife's Cobra has Eibach Prokit springs and Eagle GS-D3 315/35's on 17x10.5 Bullit replicas. I flipped the quad shocks and had to lightly massage the inner wheel wells with a BFH. No rubbing whatsoever now.